Thermal Energy Harvester Based on Magnetic Phase Change Alloy-Flexible Piezoelectric Material

Abstract

The invention relates to a magnetic-phase change alloy-flexible piezoelectric material-based hot energy collector, and belongs to the field of hot energy collection. The hot energy collector comprisesa fixed table, a flexible piezoelectric film, a magnetic-phase change alloy piece, a permanent magnet, a suspension arm and a heating table, wherein the flexible piezoelectric film is pasted onto a part above the suspension arm, the fixed table is arranged below one end of the suspension arm, one end of the suspension arm is fixedly arranged on the fixed table, the magnetic-phase change alloy piece is pasted to a lower surface of the other end of the suspension arm, the heating table is placed below the magnetic-phase change alloy piece, and the permanent magnet is suspended above the magnetic-phase change alloy piece. With the adoption of an antiferromagnetic-ferromagnetic alloy piece and the permanent magnet, the temperature of the alloy piece is raised by heating, the magnetic phase change from weak flux martensite to ferromagnetic austenite is generated, the alloy piece is absorbed, so that the permanent magnet is not pasted with a hot source, the phenomenon that the permanent magnet is heated and demagnetized due to contact with the hot source is prevented, the working of the device is also ensured without extra heat sink, and energy is saved.

Description

technical field [0001] The invention belongs to the field of heat energy collection, in particular to a heat energy collector based on a magnetic phase change alloy-flexible piezoelectric material. Background technique [0002] Thermal energy collectors can replace some traditional batteries to continuously power sensors, and have high application value in waste heat, natural heat collection and other fields. At present, the commonly used thermal energy collectors use the thermoelectricity, pyroelectricity, thermoelasticity and thermomagnetism of the material, and these types of thermal energy collectors have a series of problems such as complex process, high cost, and limited application conditions. The problem is that the connection of thermal energy harvesters to magnetic materials is beginning to receive wider attention. [0003] At present, the existing technology of using magnetic materials to make thermal energy collectors is constantly improving. In 2011, R.D.James ...

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Problems solved by technology

However, there are some problems with this technology. First, the Curie temperature of the Gd metal sheet is around room temperature, and the magnet sticking to the hot end will easily weaken the magnetism of the magnet and cause the device to fail. At the same time, a stable heat sink is needed to ensure the temperature of the cold end is maintained. At -10°C, more energy is required to maintain the normal operation of the device

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